feat(chat): desktop prompt navigator rail (#2054)

* feat(chat): add desktop prompt navigator rail

Add a ChatGPT-style right-center prompt marker rail for web/desktop chat
with hover/keyboard preview panel, load-more for partial history (panel only),
Chat setting, and mod+alt+p shortcut. Disabled in VS Code across rail,
shortcut, settings, help, and search surfaces.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(ui): read promptNavigatorEnabled from getState in shortcut handler

Match the file convention used by other shortcut handlers so the toggle
does not rely on a hook-level selector closure.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(ui): drop use-no-memo and default prompt navigator off

Remove the project-unprecedented React Compiler opt-out, and ship the
prompt navigator as opt-in to match other recent chat UI toggles.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/lib/i18n/messages/es.ts

@@ -1541,6 +1541,7 @@ export const dict: Record<I18nKey, string> = {
   "helpDialog.item.createNewSession": "Crear nueva sesión",
   "helpDialog.item.createNewWorktreeDraft": "Crear nuevo borrador de worktree",
   "helpDialog.item.focusChatInput": "Enfocar entrada de chat",
+  "helpDialog.item.togglePromptNavigator": "Mostrar u ocultar navegador de prompts",
   "helpDialog.item.abortActiveRun": "Detener ejecución activa (doble presionar)",
   "helpDialog.item.toggleRightSidebar": "Mostrar u ocultar barra lateral derecha",
   "helpDialog.item.openRightSidebarGitTab": "Abrir pestaña de Git en barra lateral derecha",
@@ -1735,6 +1736,9 @@ export const dict: Record<I18nKey, string> = {
   "chat.draftStarters.sectionSkills": "Skills",
   "chat.draftStarters.remove": "Remove",
   "chat.scrollToBottom.aria": "Ir al final",
+  "chat.promptNavigator.aria": "Navegación de prompts",
+  "chat.promptNavigator.currentPrompt": "Prompt actual",
+  "chat.promptNavigator.loadMore": "Cargar más prompts",
   "chat.timeline.relative.justNow": "ahora mismo",
   "chat.timeline.relative.minutesAgo": "hace {count}m",
   "chat.timeline.relative.hoursAgo": "hace {count}h",